Geiger counter, Wilson chamber, X-ray spectrograph, X-ray spectrometer, abjure, adversary, adversative, adverse, adversive, advocate, against the grain, against the tide, against the wind, agree to disagree, alien, allege in support, alpha pulse analyzer, ambo, answer, antagonistic, antagonize, anti, antipathetic, antipodal, antipode, antipodean, antipodes, antipole, antithesis, antithetic, antithetical, antonym, antonymous, argue for, ascender, assert, assert the contrary, at cross-purposes, at daggers, at daggers drawn, at issue, at odds, at opposite extremes, at variance, at war with, athwart, atom counter, atom-tagger, back, back to back, backward, baffle, baggage check, balancing, balk, bar, bastard type, be antipathetic, be at cross-purposes, be inimical, be opposed to, beard, beat against, beat off, belie, belly, bench, bevel, black letter, blast, block, board, body, boomerang, boron counter, brave, break, break off, buffet, cap, capital, case, challenge, champion, check, checkmate, chip, circumvent, clash, clashing, cloud chamber, collide, come back at, comeback, compensating, competitive, con, conflict, conflict with, conflicting, confound, confront, confronting, confute, contend for, contest, contra, contradict, contradictory, contradistinct, contrapose, contrapositive, contrarious, contrariwise, contrary, contrast with, contrasted, contrasting, contravene, controvert, converse, cosmic ray counter, counteract, counteractive, counterattack, counterbalance, counterbalancing, counterblast, counterblow, countercheck, countermand, counterpoint, counterpoise, counterpoised, counterpole, counterpose, counterstroke, counterterm, countervail, countervailing, counterwork, counting tube, coupon, cross, dash, dead against, defeat, defend, defy, deny, descender, desk, destroy, detrimental, differ, different, difficult, disaccord, disaccordant, disaffirm, disagree, disallow, disavow, disc, disclaim, discomfit, disconcert, discordant, discountenance, discrepant, dish, disown, disparate, disprove, dispute, disrupt, dissent, dissentient, dissimilar, divergent, diverse, drive back, electronic counter, elude, em, en, enemy, escritoire, espouse, exchange, expansion chamber, eyeball to eyeball, eyeball-to-eyeball, face, face to face, fantail, fat-faced type, feet, fend, fend off, flummox, foil, font, forswear, fractious, frustrate, gainsay, gamma ray counter, get back at, give and take, give in exchange, give in return, give-and-take, go against, go counter to, groove, hard, hardly like, harmful, hat check, heavy particle counter, heel, hinder, hindering, hit back at, hold at bay, hold off, hostile, impeding, impugn, in confrontation, in hostile array, in opposition, inconsistent, inimical, interchange, interfere with, inverse, ion counter, ionization chamber, ionizing event, italic, jangle, jar, join issue upon, join the opposition, jostle, just opposite, juxtapose in opposition, keep at bay, keep off, knock the chocks, lectern, letter